Propeller



ec. 9, 1941. F. WOLF, SR, ET AL PROPELLER Filed Nov. 2, 1940 nr 1 may v n TM MC M m. o Wkk r r 1p 0 Patented Dec. 9, 1941 PROPELLER Frank Wolf, Sr., and Frank Wolf, Jr., Middle Village, Long Island Jr'., assignor to said N. Y.: said Frank Wolf, Frank Wolf, Sr.

Application November 2, 1940, Serial No. 363,958

, 7 Claims.

This invention relates to new and useful improvements in propellers.

The invention proposes a propeller characterized by a propeller body having blades wtih a plurality of fins projecting from the face, or faces thereof, and arranged in radially spaced positions and extending across the face or faces of the blade or blades. A propeller thus constructed will be capable of displacing a greater quantity of air and so increase the propelling motion.

It is proposed to so construct the fins that the propeller may turn either clockwise or counterclockwise when facing the front.

The invention contemplates the construction of propellers having numerous characteristics by making the fins longer, shorter, higher, thicker or pitched at different angles for the most effective action under certain conditions.

The invention contemplates the construction of a propeller in which the propeller itself, or the fins, or both the propeller and fins may be pitched according to various designs.

Another object of the invention resides in movably mounting the fins on the propeller body and providing a novel means for holding the fins in various different positions to change the pitch.

Still further the invention contemplates the construction of a propeller as mentioned in which the number of fins may be varied according to various designs.

Another object of the invention is the construc-- tion of a device as mentioned which is simple and durable and which may be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. l is a front view of a propeller constructed in accordance with this invention.

Fig. 2 is an edge view thereof,

Fig. 3 is a fragmentary front view of a propeller constructed according to a modified form of the invention.

Fig'. 4 is an enlarged detailed view of a portion of Fig; 3.

Fig. 5 is a. horizontal sectional view taken on the line 55 of Fig. 3.

Fig. 6 is an enlarged horizontal sectional view of a portion of Fig. 5.

The propeller, in accordance with this invention, includes a propeller body l0 having blades ill provided with a plurality of fins II projecting from the faces thereof and arranged in radially spaced positions and extending across the faces of the blades in the particular design shown on the drawing. These fins are arranged on both faces of each blade. The fins on the opposite faces of-each blade straddle each other as may be clearly seen from a. close inspection of Fig. 2. More specifically, each fin on one side of the blade is at a location intermediate a pair of adjacent fins on the other side of the blade. The fins I I may extend the entire width of each blade, or may be shorter, or may be higher, or thicker, or pitched at different angles, according to design. The propeller blades, or the fins, orboth the propeller blades and fins may be pitched in accordance with various designs.

In Figs. 3 to 5 inclusive a modified form of the invention has been disclosed which distinguishes from the prior form in the fact that the invention is applied to a propeller Ill having blades ill of adjustable pitch and having adjustable fins. A few details of the adjustable pitched blades It will be subsequently given, however the complete details will not be given in this specification as it forms no part of the invention and propellers of this type are generally known.

Each blade I0 is provided with a plurality of fins i5 projecting from a face or faces thereof and arranged in radially spaced positions and extending across the faces of the blades. Each fin I5 is pivotally mounted at on of its ends by a pintle IS. The body of the blade l0 is formed from two sections Ill and IU which are connected together. The pintles iii are mounted on one of these sections and have internal heads Hi adjacent the other of the sections. Each pintle I6 is fixedly connected with its fin l5. The fin l5 will turn with the pintle i6 turning on the body of the blade.

A pin I8 is mounted upon the free end of each fin and extends inwards into an arcuate slot [9 formed in the body of the blade I0. This arcuate slot I9 is concentric with the pintle 16. A slotted follower 20 1s slidably arranged in a hollow 2| formed between the sections IO and m. This follower 20 has a slot 2! into which the pin l8 extends. The follower 20 is threadedly engaged on a screw 22 which is rotatively mounted transversely of the fins IS. The screw 22 is provided with a head 23 upon its outer end by which it may be readily turned. This head is disposed within a recess 24 formed in the material of the blade Ill". The inner end of the screw 22 is rotatively supported in a bearing 25 mounted between the sections Ill and Ill of the blade.

- The propeller It has a hub portion 26. The blades i ll are swivelly mounted on this hub portion and are associated with spindles 21, worm wheels 28 and Warm pinions 29 by which the pitch of the blades may be varied. g

The operation ofthe propeller is as follows:

The screw 22 may be turned in one direction or the other by engaging a suitable turning tool on the head 23. Rotations of the screw 22 will cause the followers 20 to move upwards, or downwards depending upon the direction of rotation. Changes of position of the followers 20 will change the positions of the pins I! which in turn will change the position of the fins IS. The fins will pivot, with the pintles I6 acting as the axis of pivoting. Thus the pitch of the fins may be varied, as desired.

A set screw 30 is threadedly engaged through each blade 10" and abuts each screw 22 for locking the screw in a fixed position. This prevents accidental changing of the pitches of the fins. The set screw 30 must be loosened before the screw 22 can be turned, and after the screw 22 is placed in a new turned position, the set screw 30 may be reengaged to hold it.

While we have illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we edly connected with said followers for changing the pivoted positions of said fins.

2. A propeller, comprising a propeller body having blades with a plurality of fins projecting from the faces thereof and arranged in radially spaced positions and extending across the faces of the blades, and each fin being pivotally mounted at one of its ends on the blade and having a pin on its other end extending inwards, slotted followers within said body engaging said pins, a screw rotatively mounted and threadedly connected with said followers for changing the pivoted positions of said fins, and means for locking said screw in various turned positions.

3. In a propeller, a blade formed of separate sections having a hollow between the adjacent faces of said sections, a plurality of fins projecting from the faces of said blade and arranged in blade, means for pivotally mounting one end of superimposed upon said hollow for simultaneously pivoting all of said fins to change their angular inclination," said first-means comprisingv each of said fins on said .blade, and means engaging the other ends of said fins which are memes a pintle for each of said fins freely extended through the section of said blade having its respective fin and fixedly engaged into its respec-- tive fin.

5. In a propeller, a blade formed of separate sections having a hollow between the adjacent faces of said sections, a plurality of fins projecting from the faces of said blade and arranged in radial spaced positions across the faces of said blade, means for pivotally mounting one end of each of said fins on said blade, and means engaging the other ends of said fins which are superimposed upon said hollow for simultaneously pivoting all of said fins to change their angular inclination, said latter means, comprising a pin extending from each of said fins and into said hollow through a slot formed in said blade, a screw rotatively supported in said hollow transversely of said fin, and a follower for each of said pins threadedly mounted on said screw and having a slot into which its respective pin extends for pivoting said fins as said screw is turned to move said followers.

6. In a propeller, a blade formed of separate sections having a hollow between the adjacent faces of said sections, a plurality of fins projecting from the faces of said blade and arranged in radial spaced positions across the faces of said blade, means for pivotally mounting one end of each of said fins on said blade, and means engaging the other ends of said fins which are superimposed upon said hollow for simultaneously pivoting all of said fins to change their angular inclination, said latter means, comprising a pin extending from each of said fins and into said hollow through a slot formed in said blade, a screw rotatively supported in said hollow transversely of said fin, and a follower for each of said pins threadedly mounted on said screw and having a slot into which its respective pin extends for pivoting said fins as said screw is turned to move said followers,'said followers being in face contact with the walls of said hollow to prevent said followers from tuming with said screw to cause them to move relative to said screw as the screw is turned.

'1. In a propeller, a blade formed of separate sections having a hollow between the adjacent faces of said sections, a plurality of fins projecting from the faces of said blade and arranged in radial spaced positions across the faces of said blade, means for pivotally mounting one end of each of said fin's on said blade, and means engaging the other ends of said fins which are superimposed upon said hollow for simultaneously pivoting all of said fins to change their angular inclination, said latter means, comprising a pin extending from each of said fins and into said hollow through a slot formedin said blade, a screw rotatively supported in said hollow transversely of said fin, and a. follower for each of said pins threadedly mounted on said screw and having a slot into which its respective pin extends for pivoting said fins as said screw is turned to move said followers, said slots in said blade being arcuate and arranged concentric with the pivot of said fins, said slots in said followers being elongated and arranged parallel to said fins.

' FRANK WOLF, SR. FRANK WOLF, JR. 

